If Trump is growing the party, why is he so far behind Hillary in general election polls?

Why? I thought he was bringing in all these new voters? There is an answer to this question. I’m just curious if anyone will be able to figure it out.

And before you say, “But Steve, you’re the one whose suspicious about public polling.”

Indeed, except the only time thus far the polls have been wrong on Trump are when they’ve been OVERESTIMATING his support. For example, of Cruz’s 7 wins thus far, only in Texas was he leading the public polling. That’s one out of seven.